AG3 battery.What exactly can a color ring resistor do in a circuit_Basic knowledge of resistors

　　Electronic enthusiasts provide you with what exactly the color ring resistor can do in the circuit_basic knowledge of resistors. This article mainly introduces what exactly the color band resistor can do in the circuit_basic knowledge of resistors and how to identify the color band resistor. Resistors in the circuit can provide bias voltage for the transistor, reduce the voltage at a certain point in the circuit, isolate two sub-circuits in the circuit, convert current into voltage, divide voltage, limit current, shunt and other functions. Let’s analyze it in detail below.

　　1. The role of resistors in circuits

　　When analyzing a resistor circuit, it is not necessary to consider the effect of the resistor on DC and AC respectively, nor the effect of frequency. It is only necessary to analyze the effect of the resistor value on the current, because the resistance of the resistor to these electrical signals is The value characteristics are the same. The following is the typical role of resistors in the circuit.

　　1. Provide bias voltage for transistor

　　The base of the transistor requires DC operating voltage. At this time, a resistor can be connected between the DC operating voltage and the base of the triode. The power supply provides a bias voltage to the base through the resistor R. The size of the resistor R1 determines the bias voltage. The size of this resistor is generally called a bias resistor in the circuit.

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　　2. Reduce the voltage at a certain point in the circuit

　　When a resistor is connected between the power supply and A of the circuit, the voltage at point A is lower than the power supply voltage, which can provide a suitable voltage for the light-emitting diode. Resistor R1 also limits the current of this branch to protect the light-emitting diode from burning out due to too much current. This resistor is generally called a voltage-reducing resistor or a current-limiting resistor in the circuit.

　　3. Isolate the two sub-circuits in the circuit

　　By connecting an isolation resistor between sub-circuit A and sub-circuit B in the circuit, the two parts of the circuit can be isolated. In black and white TV circuits, this circuit structure is usually used to isolate the power circuit and scanning circuits. This resistor It is generally called an isolation resistor in a circuit.

　　4. Convert current into voltage

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　　When current flows through the resistor, a voltage is generated at both ends of the resistor. As shown in the figure, the collector load resistor R2 plays this role. It converts the current flowing through the resistor R2 into a voltage and outputs it from the UO. This kind of resistor is generally used in circuits. is called the collector load resistance.

　　5. Partial pressure effect

　　When a voltage U1 is too high, two resistors can be used to form a voltage dividing circuit to reduce the voltage to U2. U2 complies with the resistor voltage dividing formula U2=U1*R2/(R1+R2). This kind of resistor is generally called Voltage dividing resistor.

　　6. Diversion effect

　　When the current flowing through a component is too large, a resistor can be connected in parallel with it to act as a shunt, conforming to the current shunt formula: I=I1+I2. This kind of resistor is generally called a shunt resistor in the circuit.

　　7. Current limiting protection function

　　Resistor R1 is used to limit the current in the circuit to prevent the base voltage of transistor VT1 from being equal to the power supply voltage VCC when the resistance of the variable resistor is adjusted to the minimum. In this case, VT1 will be damaged because the base current of VT1 is too large. This resistor is used in the circuit is generally called a protective resistor.

　　8. Decoupling effect

　　Editor's recommendation: Analysis of the installation and welding method of color ring resistor_Distinguish between the positive and negative poles of diode, triode and capacitor

　　In a multi-stage amplifier circuit, a decoupling circuit such as R1 and C1 is required in the DC voltage power supply circuit. It can prevent harmful low-frequency interference between multi-stage amplifiers. This resistor is generally called a decoupling resistor in the circuit.

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